Improvement in molds for cement pipes



UNITED STATES HENRY KNIGHT, OF JERSEY CITY, NEV JERSEY.

IMPROVEMENT IN MOLDS FOR CEMENT PIPES.

Specification forming part of Letters Patent No. 34,890, dated April 8, 1862.V

To all whom it may concern:

Be it known that I, HENRY KNIGHT, of J ersey City, in the county of Hudson and State of New Jersey, have invented a new and useful Improvement in Molds for Molding Hydraulic-Cement Pipes; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in whichm Figure 1 is a vertical section of my improved mold; Fig. 2, a horizontal section of the same. Fig. 3 is a modification of the flask and detachable collar used in connection with my main improvement. Fig. 4 is a vertical section of the flask inverted and used in connection with one of my present improvements-viz., with the detachable collar made tubular, and the core-bar also made tubular.

The same letters of reference in the several figures indicate corresponding parts.

My invention under this patent consists, first, in certain means for producing a compression of the cement within the lower end of the vertical flask, and thereby forming a solid collar with a continuous right angle socket within it after the flask has been filled from top to bottom with cement.

My invention consists, second, in the combination and arrangement of a tubular core, tubular detachable top collar, and a vertical flask, as hereinafter described.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.v

A is a stationary platform, and B a vertical tubular core projecting up from the center of the same. This core is open at its upper end, so as to receive the tubular portion of a detachable collar C, which islet down a short distance into the tubular core and sus tained by means of the shoulder a, formed by the enlarged solid portion of the collar and the tubular portion thereof, as shown. This collar is used only at the finishing operation.

D is an annular base-plate mounted on legs b b and arranged around the core B, its legs resting loosely upon the platform. The circular opening c through the center of this plate is of the same diameter as the socket to be formed in the collar of the cement pipe.

E is a circular flange or bead or shoulder projecting up from the top of the base-plate. This flange E is of a little greater diameter than the lower end of the flask which is used in molding the cement pipe, so that said lower end may fit snugly within it, as shown. There are also several small holes d d formed through the base-plate and two or more lifting-loops e e attached to its upper surface, for a purpose presently described. j

`F is a sliding collar with a horizontal circular flange f formed on it, as shown. This collar is fitted snugly round the core and its flange extends under the base-plate D a considerable distance. From the top of the flange f several guide-bars g g extend up, and when the base-plate is adjusted over the core these guide-bars pass through the holes d d, and thus couple the collar to the baseplate, the connection being maintained by means of pins h h, which pass through one or another of a series of holes in the guide-bars,

as shown. j

G is a vertical flask made in two, or more parts, which are clamped together, as shown at e' i, or in any proper manner. The lower end of this flask is of a greater diameter than the upper end. In a word, the flask is formed with t-wo diameters, and that portion which is of the largest diameter is connected with that portion which is of the smallest diameter by means of a nearly-horizontal flange j, which forms a shoulder between the two portions of the flask, as shown. This flask is arranged round the core and the lower detachable collar, and is held in position by means of the circular bead E and an adjustable centeringtable (not shown) such as I usually employ for steadying molds at their upper ends, and described in my patent dated May 8, 1860.

To operate with the mold when the parts are arranged as shown in Figs.. 1 and 2, withdraw the pins h h and lower the collar F from the position shown in black lines to the position shown in red lines. Then remove the collar C. The cement may now be inserted into the flask from the top, and when the flask is filled from top to bottom and the cement rammed compactl y the collar F must be forced upward from the position shown in red to the position shown in black lines, so as to more perfectly compress the cement into the enlarged part of the flask and to form a continuous right-angle socket, as shown at l Z,

l. The cement pipe I having in time set, the pins hl h are again withdrawn from the holes d d, in which they were placed when the collar F was raised, and the collar again lowered to the position shown in red. Before the pipe was allowed to become set the collar C, as should have been before stated, is placed on top of the flask and its tubular portion inserted into the c ore, as showninFig. l. The collai` thus adjusted is revolved on the core and made to sweep oft the surplus cement and smooth and finish the end of the cementpipe. This done, the collar C is again removed. To remove the pipe from the core, the iiask, with 'the pipe in it, is lifted over the core by taking hold of the lifting-loops of the base-plate, said plate serving to sustain the end of the pipe in its ascent. The mold and pipe are deposited upon a stand land the clamps which hold the Ysections of the mold together withdrawn, and the sections thus left free to be lifted from round the pipe. The sections being withdrawn, the pipe is raised oi the base-plate, and said plate with the sections of 'flask are readjusted over the' core, ready for another operation.

In Fig. 3 a lask made with but one diameter is shown, and the collar C is made of ring form and of a diameter externally equal to the internal diameter of the flask. With this change of construction cement pipe I with a right-angle socket Z at one end and a rightangle shoulder Z at the other end are formed, as shown. The `operation of the top collar in this plan differs only in its being pressed down into the cement a sufficient depth -to form'the right-angle shoulder l and in the collar revolving against the inner circumference of the flask, instead ot" upon the core.

In all other :respects the operation .of the mold is the same as that shown `in Fig; 1.

In Fig. 4c the sliding collar F is not shown and the base-plate is made to fit snugly round .the core. The flask shown in Fig. l is repre sented as inverted, and the tubular collar is set into the upper end of the core until its top surface has come even with the top edge of the mold.A -With this change the same style ofv cement pipe as is produced by the mold shown in Fig. l is produced, and, in fact, the same style of pipe as is produced with the mold patented to me May 8, 1860, is here Y produced. I t y A M In practice I have foundrthat cement pipe with right-angle sockets are4 the best ITonforming a tight joint. The sockets, however, might be formed with collars rounded slightly at their corners or by, collarswith angles greater than right angles without departing from the invention embraced under this patent. I have shown the modifications inFigs, 3 and 4 in order to exhibit the differentJn-odes of applying my improvements.

What I claim as my invention, and desire i t0 secure by Letters Patent, is-

`l. The combination, witha vertical iiask,- I 

